NAME

SYNOPSIS

DESCRIPTION

The
fchmodat()
system call operates in exactly the same way as
chmod(2),
except for the differences described in this manual page.

If the pathname given in
pathname
is relative, then it is interpreted relative to the directory
referred to by the file descriptor
dirfd
(rather than relative to the current working directory of
the calling process, as is done by
chmod(2)
for a relative pathname).

If
pathname
is relative and
dirfd
is the special value
AT_FDCWD,
then
pathname
is interpreted relative to the current working
directory of the calling process (like
chmod(2)).

If
pathname
is absolute, then
dirfd
is ignored.

flags
can either be 0, or include the following flag:

AT_SYMLINK_NOFOLLOW

If
pathname
is a symbolic link, do not dereference it:
instead operate on the link itself.
This flag is not currently implemented.

RETURN VALUE

On success,
fchmodat()
returns 0.
On error, -1 is returned and
errno
is set to indicate the error.

ERRORS

The same errors that occur for
chmod(2)
can also occur for
fchmodat().
The following additional errors can occur for
fchmodat():

EBADF

dirfd
is not a valid file descriptor.

EINVAL

Invalid flag specified in
flags.

ENOTDIR

pathname
is relative and
dirfd
is a file descriptor referring to a file other than a directory.

ENOTSUP

flags
specified
AT_SYMLINK_NOFOLLOW,
which is not supported.

VERSIONS

fchmodat()
was added to Linux in kernel 2.6.16.

CONFORMING TO

This system call is non-standard but is proposed
for inclusion in a future revision of POSIX.1.